Redistribution of volatiles during lunar metamorphismThermal release profiles of Pb, Zn, and Cd in sample 66095 (highly shocked breccia with melt rock matrix) showed that these volatiles were mostly present on the surface of the grains. Zn in rusty grains from 66095 was also mostly surface Zn, probably from sphalerite in grain boundaries and cracks. Simulation experiments of volatile transfer showed that Fe, FeCl2, iron phosphide, and troilite (FeS) can be produced and transported during subsolidus reactions. These results suggest that volatiles, rust, schreibersite, and possible siderophiles which are observed in lunar highland samples might have been redistributed during disequilibrium thermal metamorphism in hot ejecta blankets, and were not necessarily introduced by volcanic activity or meteoritic addition.
Document ID
19820038736
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Cirlin, E. H. (Rockwell International Science Center Thousand Oaks, CA, United States)
Housley, R. M. (Rockwell International Science Center Thousand Oaks, CA, United States)